How Much Diesel Exhaust Fluid Do Heavy-Duty Vehicles Use?

What is DEF or diesel exhaust fluid? It is a solution that is used to increase fuel economy and decrease emissions from diesel powered vehicles and is non-toxic. DEF is used in selective catalytic reduction (SCR) systems on diesel engines and consists of pure synthetic urea and deionized water.

How Much DEF?

The amount of exhaust fluid that any heavy-duty vehicle uses will depend on the various factors that vary from vehicle to vehicle and driver to driver. Some of them are as follows:

  • Size of the truck
  • Engine capacity and configuration
  • Transmission configuration
  • Manufacturer of the truck
  • Weight of the load on the truck for the specific trip
  • How fast the driver goes or how much diesel fuel he uses

If your truck is running on highways, then it probably needs a diesel exhaust fluid fill-up every third time you would fill-up your diesel tank. Your DEF is stored in a tank separate from the one you store diesel. If you check your diesel truck, close to your diesel tank you will often find a separate tank with a blue filler cap. This is the tank to store your DEF.

Run Out on DEF

Your truck’s inbuilt monitoring system gives you periodic warnings when you are running low on DEF. If you ignore these warnings and the fluid runs out completely you will lose a significant amount of power as your truck will go into limp mode and eventually shut down.

Your Supplier

Check out Jack Becker, your diesel exhaust fluid supplier for reliable advice and a ready supply of heat transfer fluids and lubricants for all your vehicle’s needs. You can also contact them at 800-488-8411 to speak with a friendly technician.

The company ownership follows business principles that are based on integrity and honesty and they aim to give all customers the very best service possible.

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